A piece of aluminum with a mass of 1.0 kg and density of 2700 kg/m3 is suspended from a light cord and then completely immersed in a container of water having density 1000 kg/m3
(a) Determine the volume of the piece of aluminum.
(b) Determine the tension in the cord when the aluminum is immersed in the container of water.
(a) 3.7 × 10-4 m3 (b) 6.2 N
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Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) The supergiant would appear as large as the full Moon in our sky. B) Earth would fly off into interstellar space. C) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun. D) Earth would be inside the supergiant.
Regular atoms did not show up in the universe until when?
What will be an ideal response?
What is one of the differences between Cepheids and RR Lyrae variables?
A) The period-luminosity relation holds only for RR Lyrae stars. B) The pulsations of RR Lyrae stars are much less regular than those of Cepheids. C) Cepheids are giants, but RR Lyrae stars are still on the main sequence. D) All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. E) The RR Lyrae stars have much shorter periods than Cepheids.
In winter, light-colored clothes will keep you warmer than dark-colored clothes if
a. you are warmer than your surroundings. b. you are at the same temperature as your surroundings. c. you are cooler than your surroundings. d. you are standing in sunlight.